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Cisco Quality of Service (QoS) Sample Questions:

1. When configuring a Cisco Catalyst switch to accommodate an IP phone with an attached PC, it is desired that the trust boundary be set between the IP phone and the switch. Which two commands on the switch are recommended to set the trust boundary as described? (Choose two.)

A) mls qos trust extend [cos value]
B) switchport priority extend trust
C) mls qos trust cos
D) mls qos cos 5
E) mls qos trust device cisco-phone
F) no mls qos trust dscp

2. Which command is typically applied to the voice traffic class within a policy-map?

A) shape peak {bps}
B) shape average {bps}
C) fair-queue
D) random-detect dscp-based
E) bandwidth {kbps}
F) compress header ip rtp

3. Refer to the exhibit. QPPB is being used by the service provider (AS30). The table-map and route-map called "important" are implemented on router POP A.
The command bgp-policy destination ip-prec-map is applied to the interface between POP A in AS30 and NAP (AS40).
Which QoS action would have to be applied on POP B in AS30 to ensure that the traffic from the NAP (AS40) to the customer (AS20) will be marked with an IP precedence of flash?

A) Traffic from AS20 must have the extended community attribute set to10:50 in a route-map, and send-community extended (or send-community both) must be specified.
B) Traffic from AS20 must be automatically marked via an inbound QoS map on POP B, resulting in the community attribute set to10:50.
C) No actions are needed. Traffic must be marked in AS20 by the customer as10:50 before it arrives at the service provider.
D) Traffic from AS20 must have the community attribute set to10:50 in a route-map, and send-community must be specified.

4. What are two benefits of WFQ? (Choose two.)

A) WFQ is very easy to configure, and no manual traffic classification is necessary.
B) WFQ can provide fixed-bandwidth guarantees.
C) WFQ can provide fixed-bandwidth and fixed-delay guarantees.
D) WFQ prevents the large-volume flows with large packet size from starving out the low-volume flows with small packet size.
E) WFQ can provide fixed-delay guarantees.
F) Based on DSCP, WFQ allows weighted, random dropping of packets when the WFQ system is full.

5. Which element is mandatory for QoS policy propagation through BGP operations?

A) NBAR
B) CEF
C) QoS pre-classify
D) MPLS
E) policy-based routing
F) MQC

Solutions: